Unitary products group G8C Installation Manual Download Page 28

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Subject to change without notice. Printed in U.S.A.

66832-UIM-D-1205

Supersedes: 66832/035-19991-001 Rev. C (0805)

Unitary

5005

Norman

Product

York

Group

Drive

73069

SECTION XI: WIRING DIAGRAM

FIGURE 40: Wiring Diagram

Nov 18, 2005 03:43PM [a5kps v1.50]

Summary of Contents for G8C

Page 1: ...orizontal Configuration 5 Vent Blower 5 Top Cap 6 Dimensions 7 Combustible Floor Base Accessory 8 Typical Attic Installation 9 Typical Suspended Furnace Crawl Space Installation 9 Side Return Cutout Markings 10 Horizontal Mount and Filter 10 Downflow Filter 10 Return Filter Grill and Return Duct Installation 11 Gas Valve 11 Upflow Configuration 50 125 MBH Model Only 12 Downflow Configuration 50 12...

Page 2: ...e within the stated rise range as indicated on the furnace rating plate and the firing input rate must be set to the unit nameplate value e The external static pressure of the air distribution system ductwork must at set for heating operation to be at least 0 10 to 0 20 inches water column based on the input rate of the furnace with the lower value for input rates less than 55 000 btu hr and the u...

Page 3: ...ized with the air distribution as possible 3 Where adequate combustion air will be available particularly when the appliance is not using outdoor combustion air 4 Where it will not interfere with proper air circulation in the confined space 5 Where the outdoor vent terminal will not be blocked or restricted Refer to VENT CLEARANCES located in SECTION VII of these instructions These minimum clearan...

Page 4: ...ALLATION POSITION 150 MBH Models This furnace may be installed in an upflow or horizontal position No conversion is necessary This furnace is not approved for downflow application CONVERSION INFORMATION 50 125 MBH Models This furnace may be shipped in either the upflow or the downflow con figuration To convert from upflow to downflow or vice versa it is neces sary only to exchange the top and bott...

Page 5: ...p cap See Figure 4 15 Install the top cap at the same end of the furnace as the vent blower using the sheet metal screws saved earlier See Figure 1 16 Install the bottom cap on the bottom of the furnace using the sheet metal screws saved earlier See Figure 1 17 The conversion is now complete The furnace may now be installed in the upflow position or in the horizontal position on either side TO CON...

Page 6: ...ar ducts attached to the plenum and there are two 7 inch round ducts attached to the furnace 1 Take 8 x 14 which equals 112 sq in X 2 which equals 224 square inch then go to round duct size located in Table 2 2 The square inch area for 7 inch round pipe is 38 4 multiply by 2 for two round ducts which equals 76 8 square inch 3 Then take the 224 square inch from the rectangular duct and add it to th...

Page 7: ...incorrect gas orifice and or a faulty limit switch can cause the furnace to operate above the maximum supply air temperature Refer to sections II III and IX for additional informa tion on correcting the problem FIGURE 5 Dimensions DOWNFLOW UPFLOW A A B E D BOTTOM VIEW F G 29 3 4 29 3 4 C 31 1 2 31 1 2 14 BOTTOM VIEW H J 16 1 4 TABLE 4 Cabinet and Duct Dimensions BTUH kW Input Output Nominal CFM m3...

Page 8: ...nstructions supplied with the duct con nector for proper installation Refer to the separate accessory parts list at the end of these instructions for the approved accessory duct con nectors When replacing an existing furnace if the existing plenum is not the same size as the new furnace then the existing plenum must be removed and a new plenum installed that is the proper size for the new furnace ...

Page 9: ...ace then the existing plenum must be removed and a new plenum installed that is the proper size for the new furnace Attach the return plenum to the furnace inlet duct flanges This is typi cally through the use of S cleat material when a metal plenum is used The use of an approved flexible duct connector is recommended on all installations The connection of the plenum to the furnace and all the duc...

Page 10: ... disposable filters Air velocity must not exceed 650 feet per minute through high velocity cleanable permanent filters Use of a filter that is too small will cause static pressure in the duct system to be too high which will have an adverse effect on heating and cooling operation Downflow Filters Downflow furnaces typically are installed with the filters located above the furnace extending into th...

Page 11: ...ducts rectangular ducts and or round ducts can be attached to the plenum Route the combustion air and the vent PVC pipes around the access panels for the filters 2 Install the filter s provided or you may install Permanent washable filters Filter should extend through the entire length of the filter rack to prevent air from bypassing the filter IMPORTANT Air velocity through throwaway type filters...

Page 12: ...le tubing over the pres sure port so that the body of the port is inside the tubing 6 Use a reducer connector to connect the 3 8 0 9 cm ID flexible tube to a 1 4 0 9 cm ID flexible tube that is connected to a U tube manometer or digital pressure measuring equipment IMPORTANT The inlet gas pressure operating range table specifies what the minimum and maximum gas line pressures must be for the furna...

Page 13: ...ll create an extremely dangerous condition resulting in premature heat exchanger failure excessive sooting high levels of carbon monoxide personal injury property damage a fire hazard and or death High altitude and propane LP conversions are required in order for the appliance to satisfactory meet the application An authorized distributor or dealer must make all gas conversions In Canada a certifi...

Page 14: ... type cycle rate adjustments Follow the thermostat manufacturer s instructions IMPORTANT Set the heat anticipator in the room thermostat to 0 40 amps Setting it lower will cause short cycles Setting it higher will cause the room temperature to exceed the set points The 24 volt 40 VA transformer is sized for the furnace components only and should not be connected to power auxiliary devices such as ...

Page 15: ...long this wire This communication makes the second furnace blower come on at the same time and on the same speed as the first furnace blower Single Wire Twinning Instructions Connect the control wiring as shown in the Figure 23 1 Connect the low voltage wiring from the wall thermostat to the ter minal strip on the control board of Furnace 1 2 Connect a wire from the TWIN terminal of Furnace 1 to t...

Page 16: ...ll for first stage heat W1 signal from the wall thermo stat Furnace 1 will start the ignition sequence and the burners will light About thirty seconds after the burners light the blowers on both furnaces will come on in heating speed When the thermostat is satis fied the burners will shut off and after the selected blower off delay time both blowers will shut off at the same time On a call for sec...

Page 17: ...ized standard or a masonry or concrete chimney lined with a material acceptable to the authority having jurisdiction Venting into an unlined masonry chimney or concrete chimney is prohibited Whenever possible B 1 metal pipe should be used for venting Where use of an existing chimney is unavoidable the following rules must be followed 1 The masonry chimney must be built and installed in accordance ...

Page 18: ...PE FLUE PIPE BURNER ACCESS PANEL CELLAR WALL OPTIONAL SIDEWALL VENT SYSTEM field supplied TOP COVER VENT DAMPER FIGURE 31 Typical Chimney Connections FIGURE 32 Horizontal Air Inlet Outlet and Chimney Connections FURNACE WATER HEATER CHIMNEY OR GAS VENT OPENING OPENING FURNACE WATER HEATER OUTLET AIR DUCT INLET AIR DUCT TABLE 10 Horizontal Sidewall Venting Clearances Horizontal Vent Length Ft m wit...

Page 19: ...t will not be affected by wind gusts light snow airborne leaves or allow recirculation of flue gases 4 Termination should be located where it will not be damaged or exposed to flying stones balls etc 5 Termination should be positioned where vent vapors are not objec tionable 6 Horizontal portions of the vent system must slope upwards and be supported to prevent sagging The vent system may be suppo...

Page 20: ... manually adjustable louvers are not permitted for use 4 A automatically operated damper or automatically adjustable lou vers shall be interlocked so that the main burner cannot operate unless either the damper or the louver is in the fully open position FIGURE 34 Combustion Airflow Path Through The Furnace Casing to the Burner Box This type of installation requires that the supply air to the appl...

Page 21: ...pliance unless otherwise permitted by the authority having jurisdiction The opening shall be located within 12 30 5 cm horizontally from the burner level of the appliance Refer to AIR SOURCE FROM OUTDOORS AND VENT AND SUPPLY AIR SAFETY CHECK in these instructions for additional information and safety check procedure 2 The duct shall be either metal or a material meeting the class 1 requirements of...

Page 22: ...nted gas CARBON MONOXIDE POISONING HAZARD Failure to follow the steps outlined below for each appliance connected to the venting system being placed into operation could result in carbon monoxide poisoning or death The following steps shall be followed for each appliance connected to the venting system being placed into operation while all other appliances connected to the venting system are not i...

Page 23: ...odule will energize open the main gas valve c After flame is established the supply air blower will start in about 30 seconds IMPORTANT Burner ignition may not be satisfactory on first startup due to residual air in the gas line or until gas manifold pressure is adjusted The ignition control will make 3 attempts to light before lock ing out With furnace in operation check all of the pipe joints ga...

Page 24: ...re and temperature correction factor of 0 960 times 3600 then divided by the time it took to measure 0 0566 m3 of gas from the gas meter For Propane LP Gas multiply the Heat content of the gas MJ m3 or Default 93 14 times 0 00283 m3 of gas measured at the gas meter times a barometric pressure and temperature correction factor of 0 960 times 3600 then divided by the time it took to measure 0 0283 c...

Page 25: ... wrench 10 Turn the electrical and gas supplies back on and with the burners in operation check for gas leakage around the gas valve pressure port for leakage using an approved gas detector a non corrosive leak detection fluid or other leak detection methods ADJUSTMENT OF TEMPERATURE RISE Be sure to relight any gas appliances that were turned off at the start of this input check TABLE 15 Inlet Gas...

Page 26: ...al System Static Pressure ESP without the filter 4 Select a filter pressure drop from the table based upon the number of return air openings or return air opening size and add to the ESP from Step 3 to determine the total system static 5 If total system static matches a ESP value in the airflow table i e 0 20 w c 50 Pa 0 60 w c 150 Pa etc the system airflow cor responds to the intersection of the ...

Page 27: ...ow 1820 51 5 1757 49 8 1664 47 1 1594 45 1 1506 42 6 1405 39 8 1287 36 4 1137 32 2 125 100 36 6 29 3 2 D High 2483 70 3 2392 67 7 2282 64 6 2161 61 2 2032 57 5 1887 53 4 1739 49 2 1567 44 4 Med High 2198 62 2 2123 60 1 2039 57 7 1930 54 7 1830 51 8 1708 48 4 1550 43 9 1413 40 0 Med Low 1999 56 6 1916 54 3 1859 52 6 1778 50 3 1684 47 7 1576 44 6 1451 41 1 1315 37 2 Low 1832 51 9 1775 50 3 1709 48 4...

Page 28: ...32 UIM D 1205 Copyright by York International Corp 2005 All rights reserved Supersedes 66832 035 19991 001 Rev C 0805 Unitary 5005 Norman Product York OK Group Drive 73069 SECTION XI WIRING DIAGRAM FIGURE 40 Wiring Diagram Nov 18 2005 03 43PM a5kps v1 50 ...

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